JetBrains RubyMine — Ruby and Rails IDE built on years proven IntelliJ platform. RubyMine brings the whole range of essential developers tools, all tightly integrated together for creating the convenient development environment for productive Ruby development and Web development with Ruby on Rails.
$99 to buy, free 30-day trial, free for educational institutions and trainers, and Open Source projects.
Intelligent Editor: code completion, code snippets and automatic refactorings More Info »
Project Navigation: wide range of views and one-click jumping between components
Error-Free Coding: on-the-fly code analysis and type inference
RSpec, Cucumber and Test::Unit support, with GUI-based test runner
Ruby Debugger: full support for Rails applications debugging and easy-to-use interface
VCS Integrations: Git, Perforce, Subversion and CVS with changelists and merge
Open API and Plugin Development SDK, ensuring IDE extensibility and flexibility More Info »